Definition
Zero trust assumes no implicit trust:
\text{Trust}_{implicit} = 0 \quad \forall \text{ requests}
In SCU terms: Every χ-mode access request requires verification—network location provides no trust for information state transitions.
Core Principle
"Never trust, always verify"
Every χ-mode access is authenticated, regardless of origin.
Why Zero Trust?
Traditional security assumes:
- Inside network = trusted
- Outside network = untrusted
Reality breaks this:
| Reality | Problem |
|---|---|
| Breaches happen | Attacker inside perimeter |
| Remote work | Legitimate users outside |
| Cloud resources | χ-modes everywhere |
| Lateral movement | One breach spreads |
Zero Trust Principles
| Principle | χ-Mode Implementation |
|---|---|
| Verify explicitly | Authenticate every χ-mode request |
| Least privilege | Minimal χ-mode access per request |
| Assume breach | Design for attacker presence |
| Micro-segmentation | Granular χ-mode boundaries |
Implementation
\text{Request} \xrightarrow{\text{Auth + Authz + Encrypt}} \text{Access}
- Identity verification: Who is requesting χ-mode access?
- Device health: Is the endpoint secure?
- Context evaluation: Is this request appropriate?
- Continuous validation: Ongoing χ-mode monitoring
Trust as Dynamic Property
\text{Trust}(t) = f(\text{identity}, \text{context}, \text{behavior}, t)
Trust is continuously evaluated, not permanently granted.
Network Irrelevance
P(\text{authorized} | \text{inside network}) = P(\text{authorized} | \text{outside})
Location provides no χ-mode privilege.
The Key Insight
Zero trust reflects χ-mode reality.
Every access must be verified:
- Network location is arbitrary
- Perimeters are porous
- Breaches are expected
- Trust is earned per-request
In a world where attackers breach perimeters routinely, assuming zero trust and verifying every χ-mode access is the only defensible position.